Effects of real and sham whole-body mechanical vibration on spinal excitability at rest and during muscle contraction.

Hortobágyi, Tibor, Rider, Patrick and DeVita, Paul (2014) Effects of real and sham whole-body mechanical vibration on spinal excitability at rest and during muscle contraction. Scandinavian Journal of Medicine and Science in Sports, 24 (6). e436-e447. ISSN 1600-0838

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Abstract

We examined the effects of whole-body mechanical vibration (WBV) on indices of motoneuronal excitability at rest and during muscle contraction in healthy humans. Real and sham WBV at 30 Hz had no effect on reflexes measured during muscle contraction. Real WBV at 30 and 50 Hz depressed the H-reflex ∼45%. These depressions diminished across the five inter-bout rest intervals. The depression converted to 27% and 7% facilitation over the 15-min long recovery period following real WBV at 30 and 50 Hz, respectively. The depression, measured during the inter-bout rest, correlated r = 0.48 (P = 0.007) with the subsequent facilitation, measured during the follow-up. The depression produced by sham vs real WBV was significant but less (23%), recovered faster, and the facilitation was absent in the 15-min long follow-up period. WBV produced time-varying depression followed by facilitation of the H-reflex at rest. A lack of change in volitional wave suggests that WBV did not affect the efferent neural drive.

Item Type:	Article
Additional Information:	Published online 19-3-2014 ahead of print.
Uncontrolled Keywords:	exercise, H-reflex, H-reflex during contraction, V wave, muscle
Subjects:	B900 Others in Subjects allied to Medicine C600 Sports Science
Department:	Faculties > Health and Life Sciences > Sport, Exercise and Rehabilitation
Depositing User:	Users 6424 not found.
Date Deposited:	24 Mar 2014 14:28
Last Modified:	12 Oct 2019 16:26
URI:	http://nrl.northumbria.ac.uk/id/eprint/15929

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